Superconductivity with large upper critical field in noncentrosymmetric Cr-bearing high-entropy alloys
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The μ0Hc2(0) is greater than the Pauli paramagnetic limit in a series of noncentrosymmetric cubic β-Mn-type Cr5+xMo35-xW12Re35Ru13C20 (0 ≤ x ≤ 9) HEA superconductors, and the μ0Hc2(0) approaches or even slightly exceeds its Pauli paramagnetic limit.
“A further signature of the unconventional nature of HEA compounds is that μ 0Hc2(0) is greater than the Pauli paramagnetic limit in a series of noncentrosymmetric cubic β -Mn-type Cr5 + x Mo35x W12Re35Ru13C20 (0 ≤ x ≤ 9) HEA superconductors, and the μ 0Hc2(0) approaches or even slightly exceeds its Pauli paramagnetic limit 88 .”
From Recent advances in high-entropy superconductors (2024) · cites this paper as [88]
The Abstract says the alloys have upper critical fields comparable to the Pauli limit, with a maximum ratio of about 1.03 at x = 6. Table I (passage 6) gives ratios of 0.95, 0.96, 1.03, and 0.85 for x = 0, 3, 6, and 9, respectively. Thus the fields approach or slightly exceed the limit, but the claim that they are greater than it across the series is not supported. (LLM, conf=0.91)
Experimental — accuracy not yet measuredQuantifying intrinsic ρN values remains challenging owing to the polycrystalline nature of high-entropy samples, where resistivity is largely influenced by grain boundary contributions.
“However, quantifying the intrinsic ρ N values remains challenging owing to the polycrystalline nature of highentropy samples, where resistivity is largely in fl uenced by grain boundary contributions 57,88 .”
From Recent advances in high-entropy superconductors (2024) · cites this paper as [88]
The paper describes its HEA samples as polycrystalline and, in the passage on upper critical field (indexed as Abstract; page unavailable), links a resistivity tail under magnetic field to carbon at grain boundaries and weak links between superconducting grains. It does not say that grain boundaries largely influence normal-state resistivity or make intrinsic ρN difficult to quantify. (LLM, conf=0.78)
Experimental — accuracy not yet measuredThese β-Mn-type HEAs show bulk superconductivity, with Tc decreasing monotonically from 5.49 K to 3.35 K as the concentration of x increases.
“These β -Mn-type HEAs show bulk superconductivity, with T c decreasing monotonically from 5.49 K to 3.35 K as the concentration of x increases.”
From Recent advances in high-entropy superconductors (2024) · cites this paper as [88]
The reduction in Tc in β-Mn-type HEAs is attributed to pair-breaking effects caused by the local moments of Cr.
“This reduction in T c is attributed to pair-breaking effects caused by the local moments of Cr.”
From Recent advances in high-entropy superconductors (2024) · cites this paper as [88]
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References 57 · Cited by 33
Research works printed but not linked: 4
- D. B. Miracle, O. N. Senkov, A critical review of high entropy alloys and related concepts, Acta Mater. 122 (2017) 448-511.
- F. Von Rohr, M. J. Winiarski, J. Tao, T. Klimczuk, R. J. Cava, Effect of electron count and chemical complexity in the Ta-Nb-Hf-Zr-Ti high-entropy alloy superconductor, Proc. Natl. Acad. Sci. U. S. A. 113 (2016) E7144-E7150.
- J. Guo, H. Wang, F. Von Rohr, Z. Wang, S. Cai, Y. Zhou, K. Yang, A. Li, S. Jiang, Q. Wu, R. J. Cava, L. Sun, Robust zero resistance in a superconducting high-entropy alloy at pressures up to 190 gpa, Proc. Natl. Acad. Sci.
- G. Xiao, Q. Zhu, W. Yang, Y. Cui, S. Song, G.-H. Cao, Z. Ren, Centrosymmetric to noncentrosymmetric struc- tural transformation in a superconducting high-entropy alloy due to carbon addition, Sci. China Mater. (2022). URL: https://doi.org/10.1007/s40843-022-2144-x. · DOI · Paper page
- Authors
- Xiao, G., Yang, W., Zhu, Q., Song, S., Cao, G.-H., & Ren, Z.
- Affiliations
- Westlake University (CN)
- Fudan University (CN)
- Zhejiang University (CN)
- Corresponding author
- Ren, Zhi
- Venue
- Scripta Materialia
- Publisher
- Elsevier BV
- Published
- 2023-01
- Volume
- 223
- Pages
- 115099
- ISSN
- 1359-6462 (ISSN-L)
- OpenAlex
- W4306643156
- Cited by
- 33
- References
- 57
- Citations by year
- 2026: 7 · 2025: 11 · 2024: 7 · 2023: 8
- FWCI
- 2.45
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Locations
- Scripta Materialia (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- arXiv (Cornell University)
- Funders
- National Natural Science Foundation of China (12050003)
- Zhejiang University
- Westlake University
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › High Entropy Alloys Studies
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Physics of Superconductivity and Magnetism
- Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Heusler alloys: electronic and magnetic properties
- Keywords
- high-entropy alloys, superconductivity, upper critical field, noncentrosymmetric superconductors, chromium doping, bulk superconductivity, superconducting transition temperature, Pauli paramagnetic limit, magnetic pair breaking, lattice parameters
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